Plex organizes all of your video, music, and photo collections, and gives you instant access to them on all of your devices. With the (free!) Plex Media Server software on your home computer and a Plex app on your favorite streaming device, you can enjoy all of your personal media and easily share it with friends and family.
Plex will also make your media look beautiful with rich descriptions, artwork, and other related information. With an optional premium Plex Pass subscription, you can even sync videos, music, and photos to your smartphones and tablets to enjoy while offline. Parental controls, premium music features, music videos, trailers and extras, and powerful management tools are also part of our premium offering. Getting up and running is fast and simple, so get started now!

Serviio is a free media server. It allows you to stream your media files (music, video or images) to renderer devices (e.g. a TV set, Bluray player, games console or mobile phone) on your connected home network.

There is also a paid for Pro edition which further enhances the possibilities of sharing content in your connected household.